JPS6021474Y2 - Centrifugal force governor for internal combustion engines - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a centrifugal force governor for an injection type internal combustion engine, and particularly relates to a maximum/minimum speed control governor.

The control rack characteristics required by supercharged engines and high-performance engines that suppress smoke generation in the low speed range and ensure sufficient output in the high speed range are as shown in Figure 1. ) is a characteristic that increases and changes in stages as the value increases.

For example, the speed governor known from Japanese Utility Model Publication No. 47-529 has a fulcrum in the governor case, rotates in the fuel increasing direction during the Angleich stroke of the flyweight, and is moved to its initial position by a stopper. An adjustable maximum fuel lever is installed, and a connecting rod that connects the control rack and the floating lever is opposed to the maximum fuel lever, so that the control rack is moved in the direction of fuel increase as the engine rotation increases. ing.

However, in this governor, the space for the Angleich spring installed in the flyweight is limited, and in reality only one Angleich spring can be installed, so the rack characteristics with respect to the rotation speed are limited and multiple It is not possible to obtain curved characteristics or other complex characteristics, and furthermore, parallel movement of the rack characteristics is necessary to ensure output, and it is desirable to be able to easily change it while the engine is running. This is not possible and there are difficulties in adjusting the engine to suit the engine.Furthermore, the surplus fuel necessary for starting cannot be discharged, and the fuel is limited even at low speeds, resulting in a lack of output. It has the following disadvantages.

Therefore, an object of the present invention is to provide a maximum/minimum speed control type speed governor that can easily obtain starting increase characteristics and other complicated characteristics.

The present invention will be described below with reference to embodiments shown in the drawings.

In FIG. 2, a flyweight retainer 2 fixed to a camshaft 1 of a fuel injection pump (not shown) has an umbrella portion 2a.
There is an idle spring 4 between the umbrella part 2a and the flyweight 3, and a main spring 5 is attached with a strong mounting load between the slidable case 6 and the umbrella part 2a.

The movement of the case 6 toward the camshaft 1 is restricted by the sleeve 7, and an Angleich spring 9 is provided between the slidable seat 8 and the case 6, and there is a gap between the seat 8 and the case 6. There is a (Angleich stroke).

The radial movement of flyweight 3 is bell crank 10.
This is converted into horizontal movement of the bearing bolt 11 in the figure.

The bearing bolt 11 has two flat parts 11a and llb.
This flat portion 11a is shaped like this.

A slider 12 is fitted between the sliders 11b so as to be slidable in the vertical direction.

Further, the pin 12a of the slider 12 is rotatably connected to the lower end of the floating lever 13, and the pin 12a of the slider 12 is
One end of a supporting lever 14 is rotatably fitted into 2a, and the other end of the supporting lever 14 is rotatably supported by a pin 36 on the governor case.

The upper end of the floating lever 13 is connected to a connecting rod 16 by a pin 15, and a control rack 17 is connected to this connecting rod 16.

A sliding piece 19 and a shackle 20 are rotatably attached to another pin 18 provided at the upper end of the floating lever 13, and a bent portion 19a formed on the sliding piece 19 is opposed to the outside of the shackle 20. and tension spring 21
is hung between the floating lever 13 and the bent portion 19a.

On the other hand, the middle part of the amplification lever 22 is rotatably supported by the pin 13a of the floating lever 13, and the lower end of the amplification lever 22 is screwed into the governor case so that its position can be adjusted. A pin 22 fixed to the upper end of the amplification lever 22 whose movement to the left is restricted
a is engaged with the elongated hole 20a of the shackle 20, and a spring 25 is applied between the amplification lever 22 and the floating lever 13 to apply a clockwise moment to the amplification lever 22.

Note that the stopper 23 is positioned by nuts 24a and 24b.

Further, the spring 21 is set to be weaker than the spring 25 in terms of load.

A vertical groove 13 formed in the middle part of the floating lever 13
A pin 26 attached to the steering lever 28 is slidably fitted in b.

The shaft 30 connected to the speed regulating lever 27 has a flat portion 3.
0a, the steering lever 28 is hollow, and a shaft 30 is rotatably fitted into one end of the steering lever 28 from a right angle direction.

The steering lever 28 has a built-in compression spring 29, which faces the flat portion 30a of the shaft 30, so that the steering lever 28 and the speed regulating lever 27 normally rotate together.

However, when the rotation of the floating lever 13 is restricted, the steering lever 28 moves against the shaft 30 (speed regulating lever 27) against the spring 29 as shown in the figure.
It can be rotated clockwise relative to the

A cam 31 having a cam surface 31a is attached to the governor case with bolts 32, facing the tip 19b of the sliding piece 19.

A bolt hole 37 through which the bolt 32 is passed is shaped like a long hole, and the mounting position of the cam 31 can be adjusted in the left-right direction in the figure.

In addition, the idle spring 4 is added to the thrust of the fly weight 3.
In the rotation range where only the amplification lever 22 and the stopper 23 operate in opposition, the lower end of the amplification lever 22 and the stopper 23 do not come into contact with each other, and the flyweight 3
The position of the stopper 23 is adjusted so that the lower end of the amplification lever 22 and the stopper 23 come into contact with each other at the same time as the amplification lever 22 contacts the seat 8.

Next, the operation will be explained.

When the speed regulating lever 27 is placed at the full load position with the engine stopped, the bearing bolt 11 is located at the far right side in the figure since there is no lift of the flyweight 3, and the slider 12 is moved by the action of the supporting lever 14. is lowered, and the floating lever 13 is also in a lowered position.

Therefore, the tip end 19b of the sliding piece 19 comes off the cam surface 31a, and the floating lever 13 rotates counterclockwise, thereby providing fuel increase characteristics at the time of starting.

After starting, first, within the control range of the idle spring 4, the position of the stopper 23 is adjusted so that the amplification lever 22 does not act as described above, so the slider 12 moves horizontally as shown in the figure as the bearing bolt 11 moves. While being displaced in the direction, the sliding piece 1 is pushed upward in the figure by the action of the supporting lever 14.
9 slides on the cam surface 31a to obtain predetermined rack characteristics.

Next, in the Angleich stroke a in which the Angleich spring 9 acts, the sliding piece 19 is moved upward in the figure by the rotation of the supporting lever 14 as the rotational speed increases.

Furthermore, since the amplification lever 22 is in contact with the stopper 23, it rotates counterclockwise about the pin 13a as a fulcrum, so the pin 22a moves within the elongated hole 20a of the shackle 20.
The shackle 20 rotates clockwise about the pin 18, and since the sliding piece 19 is also biased by the spring 21, it rotates in response to the force, and as a result, the tip 19b of the sliding piece 19 Move further upwards in the diagram.

In this way, the amount of displacement of the tip 19b of the sliding piece 19 is amplified, making it possible to easily obtain complex rack characteristics. For example, in the case of the shape of the cam surface 31a as shown in the figure, the first It is possible to obtain rack characteristics as shown in the figure.

During Angleich stroke a, the floating lever 13 is moved in the fuel increasing direction (counterclockwise) by the safety mechanism formed by the compression spring 29 built into the steering lever 28 and the flat part 30a of the shaft 30 as shown in the figure. It is adjusted so that it is biased, and the bias disappears as soon as the Angleich stroke a ends.

When the Angleich stroke a ends, the bearing bolt 11 is stopped until the flyweight 3 starts to expand against the main spring 5, and the main spring 5
When the fly weight 3 compresses, the bearing bolt 11 is pulled to the left again as shown in the figure, and the floating lever 1
3 rotates clockwise about the pin 26 as an intermediate fulcrum to operate the control rack 17 in the direction of fuel reduction, thereby performing high-speed control.

At this time, the lower end of the amplifying lever 22 remains in contact with the stopper 23, so the pin 22a at the upper end is attached to the shackle 20.
is further rotated clockwise, and the sliding piece 19 follows suit and rotates clockwise, but since the floating lever 13 itself rotates in the direction of fuel reduction, the cam surface 31a and the tip of the sliding piece 19 The portions 19b are separated, so that the clockwise rotation of the sliding piece 19 is independent of the rack characteristics.

By the way, when the speed regulating lever 27 is rotated clockwise,
From a certain point, the steering lever 28 also rotates together, the floating lever 13 also rotates clockwise about the pin 12a, and the sliding piece 19 moves away from the cam 31.

Therefore, this speed governor can obtain characteristics of maximum and minimum speed control type.

Note that if the cam 31 is shaped as shown by the broken line in FIG. 2, the position of the control rack 17 at the time of starting can be defined by the sliding piece 19 and the cam 31.

As explained above, if the centrifugal force governor for internal combustion engines of the present invention is used, even if the Angleich stroke cannot be increased due to design, the displacement of the sliding piece is amplified by the amplification mechanism, so the cam can be adjusted accordingly. The length of the surface can be increased, and even if the cam surface has complex irregularities, the tip of the impulse piece can sufficiently follow it.

Therefore, complex control rack position characteristics at full load can be easily obtained.

In addition, since the sliding piece moves as the flyweight moves even in the low-speed control range of low rotations and when the regulating lever is at the full load position, the rack position at that time can be adjusted arbitrarily by setting the cam shape. It can be adjusted, thus eliminating problems caused by insufficient power at full load and low speed or insufficient fuel at start-up.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the characteristics obtained by the speed governor of the present invention, and FIG. 2 is a partially sectional configuration diagram showing an embodiment of the present invention. 3... Fly weight, 11... Bearing bolt, 13... Floating lever, 14... Supporting lever, 17...
...Control rack, 19...Sliding piece,
19b...Tip, 20, 22.23...
・・Shackle, amplification gear, topper, 26 ・・pin (fulcrum), 27 ・ ・
... Speed control lever, 28 ... Steering lever, 29 ... Spring, 31 ...
Cam, a... Angleich stroke.

Claims (1)

[Scope of utility model registration request] A bearing bolt that is displaced in conjunction with the flyweight, a floating lever that is rotated around a fulcrum to displace the control rack according to the displacement of the bearing bolt, and an adjustable lever that holds the fulcrum and moves the fulcrum during operation. A sliding piece that interlocks with the speed lever and the floating lever, a cam installed opposite to the tip of the sliding piece, and a cam that rotates with the displacement of the bearing bolt and rotates in the direction of movement of the bearing bolt. a supporting lever that applies a displacement in a direction perpendicular to the floating lever and the sliding piece; and a supporting lever that has a fulcrum on a part of the floating lever at least in an Angleich stroke region of the flyweight and that controls displacement of the bearing bolt. an amplification lever that amplifies and additionally applies the amplified displacement to the sliding piece; a stopper that suppresses movement of the lower end of the amplification lever in the axial direction of the bearing bolt; and a stopper that connects the amplification lever to the sliding piece. and an amplification mechanism having a shackle, the centrifugal force governor for an internal combustion engine configured such that when the speed governor lever is in a full load position, the floating lever is biased in a fuel increasing direction.